1-amino-4-hydroxy-2-(cyano- and cyanoalkyl-phenoxy)-anthraquinones



United States Patent 3,329,692 l-AMINO-4-HYDROXY-2-(CYANO- AND CYANO- ALKYL-PHENOXY)-ANTHRAQUINONES Visvanathan Ramanathan, Basel, Switzerland, assignor to 5 Ciba Limited, Basel, Switzerland, a Swiss company No Drawing. Filed July 8, 1963, Ser. No. 293,285

Claims priority, application Switzerland, July 9, 1962,

3 Claims. (Cl. 260-380) The present invention provides 1-amino-2-aryloxy-4-hydroxy-anthraquinones that are free from acidic groups imparting solubility in Water, especially sulfonic acid groups, and whose aryl radical contains at least one group of the formula 2)n 1- in which n represents an integer of 1 to 10.

The dyestuffs advantageously correspond to the formula 2O o NH,

that

litm

in which p represents an integer of 1 to 3.

The new dyestuffs are obtained when a 1-amino-2-halogen-4-hydroxy-anthraquinone, especially l-amino-Z-brorno-4-hydroxy-anthraquinone, is reacted with a hydroxylaryl compound that contains at least one group of the formula in which n has the meaning given above. The starting materials advantageously used are hydrobenzenes, especially those of the formula in which m, n and Ar have the meanings given above and in which the arylene radicals may contain further substituents that do not impart solubility in water, for example, halogen atoms, alkyl alkoxy, alkoxy-carboxy, aliphatic acyl or nitro groups.

Hydrobenzenes that are specially suitable for the manufacture of the new dyestutfsaccording to the process of the invention are those of the formula in which p represents an integer of l to 3.

0 "ice As examples there may be mentioned:

hydroxy-cyano-aryl compounds, for example, 1-hydroxy-4-cyanobenzene, 1-hydroxy-3-cyanobenzene, 1-hydroxy-2-cyanobenzene, and 1-hydroxy-Z-chloro-4-cyanobenzene, hydroxy-cyano-alkyl-aryl compounds, for example, 1-hydroxy-4-,8-cyano-ethylbenzene, 1-hydroxy-3-cyanomethylbenzene, 1-hydroxy-4-cyanomethylbenzene and 1-hydroxy-2-bromo-[3-4-cyano-ethylbenzene.

The reaction is advantageously carried out in the presence of an agent capable of binding acid, for example, an alkali hydroxide such as sodium or potassium hydroxide or an alkali carbonate.

The reaction in accordance with the process of the invention can be carried out in an inert solvent, for example, in nitrobenzene, or in an excess of the phenolic reaction component. It is advantageously performed at an elevated temperature.

The new dyestuffs so obtained are eminently suitable, especially after conversion into a finely dispersed form, for dyeing and printing synthetic fibrous material, especially fibrous material made of aromatic polyesters, and they are also suitable for dyeing and printing cellulose ester fibres and polyamide fibres. Red dyeings that are distinguished by a specially good fastness to light and to sublimation are obtained on such fibres by the conventional dyeing methods, for example, from a dye liquor, which contains a dispersion of the dyest-ufi and advantageously a dispersing agent, at a temperature close to C., if necessary, in the presence of a swelling agent, or at a temperature above 100 C. under super-atmospheric pres sure.

The new dyestuffs possess good building-up properties.

A further attribute of the dyestuffs of the invention is that they reserve wool Well, which makes them specially suitable for the dyeing of union fabrics made of polyester fibres and wool,

The dyestuffs of the invention are also suitable for application by the so-called Thermosol process, in which process the fabric to be dyed is impregnated at a temperature not exceeding 60 C. with an aqueous dispersion of the dyestufi that advantageously contains 1 to 50% of urea and a thickening agent, especially sodium alginate, and then squeezed in the usual manner. Advantageously, squeezing is carried out in such a manner that the impregnated fabric retains 50 to 100% by weight of dye liquor, calculated on its dry weight. In order to bring about fixation of the dyestuff, the fabric thus impregnated is heated to a temperature above 100 C., for example, to a temperature between and 210 C., advantageously after an intermediate drying operation, for example, in a current of hot air.

The Thermosol process just mentioned is of special interest for the dyeing of union fabrics made of polyester fibres and cellulosic fibres, especially cotton. In this case, the padding liquor contains, in addition to the dyestuff of the invention, dyestufi's suitable for dyeing cotton, for example, vat dyestuffs. When the latter are used, the padded fabric has to be treated with an aqueous alkaline solution of one of the reducing agents normally used in vat dyeing after it has been subjected to the heat treatment.

The following examples illustrate the invention. The parts and percentages are by weight:

Example 1 A mixture comprising 25 parts of l-amino-Z-bromo- 4-hydroxy-anthraquinone, 100 parts of 1-hydr0xy-4-B- cyano-ethylbenzene and 6.5 parts of potassium carbonate is heated for about 22 hours at 155 C., while stirring. After cooling the reaction mixture, 100 parts of alcohol are added, while stirring, the dyestutf which precipitates thereby is filtered off and then washed with hot water. The dyestufi so obtained dyes polyester fibres red tints. possessing a good fastness to light and to sublimation, and reserves to a large extent wool treated in the same dyebath.

By using the same amount of 1-hydroxy-4-cyanomethylbenzene or 1-hydr0xy-4-cyanobenzene (parahydr-oxybenzonitrile) instead of 1-hydroxy-4-fl-cyanoethylbenzene, dyestufis possessing similar properties are obtained.

Example 2 1 part of an aqueous paste of the dyest-uir" obtained in the manner described in the first paragraph of Example 1 and approximately 1 part of dried sulfite cellulose Waste liquor are ground to a fine paste in a roller mill, the paste so obtained having a dyestutf content of about 100 parts of fibrous material made of polyethylene terephthalate are washed for /2 hour in a bath containing 1 to 2 parts of the sodium salt of N-benzyl- -heptaded ylbenzimidazole disulfonic acid and 1 part of a concentrated aqueous ammonia solution per 1000 parts of water. The material is then treated for minutes at 50 C. in a bath containing 9 parts of diammonium phosphate and 1.5 parts of the sodium salt of N-benzyl-n-heptadecylbenzimidazole disulfonic acid in 3000 parts of Water.

9 parts of sodium-ortho-phenylphenolate (dissolved) are then slowly added and uptake of the liberated orthophenyl-phenol is brought about by agitating the textile material for 15 minutes at 50 to 55 C. 10 parts of the dyestuff paste obtained in the manner described in the first paragraph of this example are then added. The dyebath is then brought to the boil in the course of /2 to hour and dyeing is continued for 1 to 1 /2 hours at a temperature as close to the boil as possible. The material is then well rinsed and, if necessary, washed for /2 hour at 60 to 80 C. in a solution containing 1 part of the sodium salt of N-benzyl-y.-heptadecylbenzimidazole disulfonic acid per 1000 parts of water. A red in which Ar represents a phenylene radical, and n reprer sents an integer of 1 to 5.

2. Dyestuifs as claimed in claim 1 of the formula in which p represents an integer of 1 to 3.

3. The dyestuif as claimed in claim 1 of the formula References Cited UNITED STATES PATENTS 2,820,051 1/1958 Buc 260380 X 2,850,510 9/1958 Hoefie et al. 260373 3,226,177 12/1965 Hosoda et al 260380 X 3,264,325 8/1966 Lewis 260-380 OTHER REFERENCES 7 Luos, H. A.: Synthetic Dyes and Pigments, 1955, pp. 670-671. New York, Hafner Publishing Co.

LORRAINE A. WEINBERGER, Primary Examiner.

HAROLD C. WEGNER, Assistant Examiner. 

1. DYESTUFFS OF THE FORMULA 